Abstract
Foliar spraying is employed in this study to test the effect of 5-aminolevulinic acid (hereafter 5-ALA), aqueous-organic solvents and their compounds on the quality of Rosa rugosa. The results showed that, compared with the control group (foliar spraying of fresh water), foliar application of 5-ALA or aqueous-organic solvents singly, or in combination, all have various improving effect on rose leaf area, flower diameter (indicating size of the flower), stem length, opening rate, flower color and the total biomass; foliar spraying of 5-ALA and aqueous-organic solvents jointly or mere 5-ALA both can increase the chlorophyll content of unit area leaf, while mere aqueous-organic solvents will decrease the unit area leaf chlorophyll content. The conclusion is that, joint foliar spraying of 5-ALA and aqueous-organic solvents will lead to the optimal result on the quality of Rosa rugosa by way of making full use of the mutually beneficial interaction between 5-ALA and aqueous-organic solvents. This finding no doubt, will shed light on the improvement of Rosa rugosa quality and benefit the future development of the Rosa rugosa industry.
Highlights
Rosa rugosa thunb, ranking among the most famous “top four cut-flowers”, plays an essential role in the world flower industry (Chen et al, 2010; Park et al, 2011)
The results showed that 5-ALA and aqueousorganic solvents could lead to mutually beneficial interaction when combined with each other and the contribution made by such an interaction to the total biomass is 0.9%
The results showed that the respective increase rates on rose leaf area, flower diameter and stem length, brought about by the mutual beneficial interaction of 5-ALA aqueous-organic solvents, are 9.59, 1.6 and 2.1%, respectively
Summary
Rosa rugosa thunb, ranking among the most famous “top four cut-flowers”, plays an essential role in the world flower industry (Chen et al, 2010; Park et al, 2011). When combined in foliar spraying, 5-ALA and aqueous-organic solvents promise an improvement on the unit area leaf, stem length and flower diameter.
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